/**
 * Copyright (c) 2018-2028, DreamLu 卢春梦 (qq596392912@gmail.com).
 *
 * <p>Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0; you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * <p>http://www.gnu.org/licenses/lgpl.html
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package xyz.fivefaith.tool.common.constant;

import org.apache.commons.lang3.StringUtils;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.charset.UnsupportedCharsetException;

/**
 * 字符集工具类
 *
 * @author L.cm
 */
public class CharsetPool {

    /** 字符集ISO-8859-1 */
    public static final Charset ISO_8859_1 = StandardCharsets.ISO_8859_1;

    public static final String ISO_8859_1_NAME = ISO_8859_1.name();

    /** 字符集GBK */
    public static final Charset GBK = Charset.forName(StringPool.GBK);

    public static final String GBK_NAME = GBK.name();

    /** 字符集utf-8 */
    public static final Charset UTF_8 = StandardCharsets.UTF_8;

    public static final String UTF_8_NAME = UTF_8.name();

    /**
     * 转换为Charset对象
     *
     * @param charsetName 字符集，为空则返回默认字符集
     * @return Charsets
     * @throws UnsupportedCharsetException 编码不支持
     */
    public static Charset charset(String charsetName) throws UnsupportedCharsetException {
        return StringUtils.isBlank(charsetName)
                ? Charset.defaultCharset()
                : Charset.forName(charsetName);
    }
}
